Question

What does tapetum lucidum do?
A. It is the coloured part of the eye.
B. Gives animals night vision.
C. Transparent jelly-like fluid.
D. It is the area where the optic nerve attaches.

Answer 1

HINT:
The biological reflector system, made up of regularly arranged fibres in the choroid region of the eye between the lens and the retina is called tapetum lucidum.

COMPLETE STEP BY STEP ANSWER:
The pigmented, opaque, visible coloured portion of the eye is called iris which regulates the diameter of the pupil.
Eyeshine characteristic of many animals is due to tapetum lucidum. Tapetum along with rod cells enhances visual sensitivity of animals under low light conditions. The tapetum lucidum gives animals their night vision and allows them to see in dimmer lights. In animals, tapetum lucidum is present behind the retina and when the night light rays fall on the tapetum membrane, they bounce off and restimulate the photoreceptor cells to use the light. Humans do not possess tapetum lucidum due to which their night light vision is very poor. Animals have the capability to see at night while humans cannot see very clearly during night.
The vitreous humor is the transparent jelly-like fluid in the space between the lens and the retina called vitreous chamber.
The optic nerves leave the eye and retinal blood vessels enter it at a point medial to and slightly above the posterior pole of the eyeball.
Thus, the correct answer is:- gives animals night vision.

Option ‘B’ is correct

NOTE:
Tapetum lucidum is present in most mammals but is absent in pigs and primates. Humans do not have tapetum lucidum in their eyes. Our eyes appear red due to flashlights in photographs because the camera flashes off the red blood cells of the choroid tissue.